Parisphinctes, large ammonite

Perisphinctes is an extinct genus of ammonite cephalopod. They lived during the Late Jurassic Epoch and serve as an index fossil for that time period. The original of this specimen is from Madagascar.

Ammonoids are an extinct group of marine mollusk animals in the subclass Ammonoidea of the class Cephalopoda. These mollusks are more closely related to living coleoids (i.e., octopuses, squid, and cuttlefish) than they are to shelled nautiloids such as the living Nautilus species. The earliest ammonites appear during the Devonian, and the last species died out during the Cretaceous–Paleogene extinction event.

Ammonites are excellent index fossils, and it is often possible to link the rock layer in which a particular species or genus is found to specific geologic time periods. Their fossil shells usually take the form of planispirals, although there were some helically spiraled and nonspiraled forms (known as heteromorphs).

The name "ammonite", from which the scientific term is derived, was inspired by the spiral shape of their fossilized shells, which somewhat resemble tightly coiled rams' horns. Pliny the Elder (d. 79 AD near Pompeii) called fossils of these animals ammonis cornua ("horns of Ammon") because the Egyptian god Ammon (Amun) was typically depicted wearing ram's horns. Often the name of an ammonite genus ends in -ceras, which is Greek (κέρας) for "horn". 



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Parisphinctes, large ammonite 

resin
21 x17 inches
Item 1876 

Category: Replicas
Type: Skeletons
Phylum: Invertebrates
Class: Amphibians

$300.00 

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Parisphinctes, large ammonite

Parisphinctes, large ammonite

Parisphinctes, large ammonite



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